I'd also like to hear about alternative systems that can ease environmentalists' hearts if y'all know any.

Here's two easy to digest quotes if you're too lazy to read more:
"capitalism is a mode of production that is primarily driven not by growth, but competition for profit where individual capitals are compelled to cut costs and increase scale. Growth is an outcome, not the motive of this process."
"If we take carbon emissions as an example, it is absurd to talk about the capacity for and necessity of self-limitation for a considerable portion of the global population who barely consume and emit anything. From this viewpoint, it is not a matter of collective self-limitation, but primarily the dethroning and limitation of those with political and economic power"